fix(stream): set the correct initial offset value.

source/dnode/vnode/src/tq/tq.c

@@ -130,6 +130,8 @@ int32_t tqInitialize(STQ* pTq) {
     return -1;
   }
 
+  // the version is kept in task's meta data
+  // todo check if this version is required or not
   if (streamLoadTasks(pTq->pStreamMeta, walGetCommittedVer(pTq->pVnode->pWal)) < 0) {
     return -1;
   }
@@ -554,7 +556,7 @@ int32_t tqProcessSubscribeReq(STQ* pTq, int64_t sversion, char* msg, int32_t msg
   return 0;
 }
 
-int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t UNUSED_PARAM(ver)) {
+int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t ver) {
   int32_t vgId = TD_VID(pTq->pVnode);
   pTask->id.idStr = createStreamTaskIdStr(pTask->id.streamId, pTask->id.taskId);
   pTask->refCnt = 1;
@@ -570,6 +572,7 @@ int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t UNUSED_PARAM(ver)) {
   pTask->outputStatus = TASK_OUTPUT_STATUS__NORMAL;
   pTask->pMsgCb = &pTq->pVnode->msgCb;
   pTask->pMeta = pTq->pStreamMeta;
+  pTask->chkInfo.version = ver;
 
   // expand executor
   if (pTask->fillHistory) {
@@ -755,7 +758,7 @@ int32_t tqProcessTaskDeployReq(STQ* pTq, int64_t sversion, char* msg, int32_t ms
 
   tDecoderClear(&decoder);
 
-  // 2.save task
+  // 2.save task, use the newest commit version as the initial start version of stream task.
   code = streamMetaAddDeployedTask(pTq->pStreamMeta, sversion, pTask);
   if (code < 0) {
     tqError("vgId:%d failed to add s-task:%s, total:%d", TD_VID(pTq->pVnode), pTask->id.idStr,

tests/system-test/1-insert/delete_childtable.py

@@ -27,7 +27,7 @@ class TDTestCase:
     def init(self, conn, logSql, replicaVar=1):
         self.replicaVar = int(replicaVar)
         tdLog.debug("start to execute %s" % __file__)
-        tdSql.init(conn.cursor())
+        tdSql.init(conn.cursor(), True)
         self.dbname = 'db_test'
         self.setsql = TDSetSql()
         self.stbname = 'stb'